STORM-1051: Fixup to LLWindowListener per code review.

Bug: capturing a const ref to value returned by LLSD::asString() not so good.
Bug: LLWindowListener::keyUp() was calling handleTranslatedKeyDown().
In keyDown and keyUp, support keysym lookup (e.g. "TAB") as well as integer
keycode.
In keyDown, keyUp, mouseDown, mouseUp and mouseMove, support modifier mask by
accepting an array of "CONTROL", "SHIFT" etc. strings.
State in operation doc strings valid values for button, keycode, keysym, mask.
The LLWindowListener(... LLKeyboard*) constructor param gKeyboard is always
NULL at the time LLWindowListener is constructed. Eliminate tests and global
references to gKeyboard by replacing with a more Feathers-style LLKeyboard*
getter function.

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